Lakemoor Police said they are trying to determine how a 30-year-old woman fell out of a third-story window and onto a parked car, then walked into a neighbor's house and slept for two hours.

Police Chief Mike Marchese said family members believe the woman woke up about 3:30 a.m. in her townhouse on Pondview Lane and attempted to open a third-story window.

The woman, who police have not identified, may have slipped after opening the window, Marchese said. She crashed through the screen, and landed on the hood of her car in the driveway below, he said.

She bounced off the car and landed on the pavement, he added.

"After hitting the ground, she got up and wandered over to the neighbor's house, where he left the garage door open," Marchese said. "She walked through the garage door, into the house, then fell back asleep on the neighbor's couch."

He said the neighbor saw the woman sleeping on the couch at about 5:30 a.m., two hours after the fall, and phoned 9-1-1.

She was taken by the McHenry Fire Protection District to Centegra Hospital-McHenry. She was not suffering from any life-threatening injuries, Marchese said, but he did not know her condition.

"There is absolutely no indication that alcohol or any drugs played a role in this at all," he said. "There are no signs of foul play or of a break-in or anything. All the circumstances show that this was a freak accident."

Police are investigating, and officials plan to interview the woman after she is released from the hospital, he said.